Coke oven door or the like



y 1940- P. VAN ACKEREN 2,200,403

COKE OVEN DOOR OR THE LIKE Filed Dec. 22, 1937 2 Sheets-Sheet 2 atentat] Ed, 19450 COKE OVEN DOOR OR THE LIKE Paul van Ackeren, Essen, Germany, assignor, by mesne assgnments, to Koppers -Company, Pittsburgl, Pa., a corporation of Delaware Application December 22, 1937, Serial No. 181,195 In Germany December 23, 1936 5 Claims. '(Ol. 202-248) The invention relates to closure means for chamber or retort ovens for the production of gas and coke and in particular to the so-oalled self-sealing doors for those ovens.

In the description, the term "self-scaling door" is intended to cover that type oi coke oven doors or the like in which the metal door fits in a gastight manner against 'the metal door-frame or doorway surround's, without inserting between door and door-frame or doorway surrounds a' non-metallic packing material, for instance asbestos or the like.

self-scaling doors have a frame-like-resilient member which fits against the door-frame or doorway surrounds, 'said member may be connected with the rigid body of the door by means of an elastic sheet metal plate. The front or knife edge of the said resilient member is carefully machined so as to insure a gas-tight seal when resting on a suitably machinect surface of the door-frame or doorway surrounds. Means are provided on the body of the door in order to press the said resilient member with its knifelike rim or flange against the door-frame or doorway surrrounds, when closing the door, in such a way that said knife-like rim follows exactly the packing or scaling surface of the doorframe or surrond, even if the same should become warped on account of the heat radiating from the coking chamber.

The rigid door body is fitted with means for fastening the door in closed position, ior instance looking bars, and is also equipped with means for carrying the refraotor'y inside lining which protects the metal body of the door against the heat radiating from the coking chamber.

In order to obtain a good, gas-tight sealing with the so-called self-scaling doors of coke ovens, it is very essential that the packing surfaces of the door frame and knife-like rim of the resilient member extending at the outer margin of the door body, always be kept free and clean.

In this respect, the known types of self-sealing doors show certain disadvantages.

Tarry constituents developed in the coking process tend to enter the free space between the door and the door frame and condense on the comparatively cool metal parts of the closure means. Thus, accumulations and crustations are formed on the packing surfaces of the door frames, the removal of which is necessary in order to maintain a proper seal of the chamber opening. The removal of those accumulations and crustations requires much manual work. A

Many suggestions have already been mr e to prevent the formation of the before mentioned accumulations and crustations on the scaling surfaces* of the doors. It has been tried to keep the metal parts of the doors, by means of a heat insulating bricklining, at such a high Operating 5 temperature that tarry constitutients could not condense on these parts. It has, however, been found in practical operation that this provision was not efiective enough although a slight improvement could be arrived at.

After this it has been suggested to equip the door with a second inner packing lying in a zone of such high temperatures that no condensations could take place on such inner packing means. According to that well-known proposition, the primary or inner packing consists of an elastic projection provided at the rigid body of the door. The elastic projection fits against the door frame when the door is closed.

such an inner packing is indeed most suitable to avoid the formation of accumulations or crustations on the outer packing means, which have to insure the gas-tight scaling. It has, however, been found that the elastic projection of the inner packing loses its elasticity rather quickly due to the high temperature to which the inner packing means have been brought during the operation of the coke oven.

Now the main object of the present invention is to provide such improvements in self-sealing coke oven doors or the like which makes possible a permanent and effective primary inner packing so that the important outer packing means are kept clean.- and fully efi`ective.

My invention consists principally in providing the door with two independent packings sealed metal-on-metal, which are arranged movable and adjustable relatively to each other, at least in the direction of the doorway or opening of the chamber or retort to be closed, in such a way that by moving the door parts carrying the inner packing in the direction of the doorway, the inner packing can be sealed independently of the position of the outer packing means if the door is closed.

My present invention further consists in that the door parts carrying the inner packng and the door parts carrying the outer packing are connected with one another by springs, or another elastic means, arranged at the outer surface of the door in such a manner that on closing the outer packing, the inner packing means are moved elastically into their closing position.

According to my invention, both the inner and outer door parts may alternatively be interconarranged thereon cleaned before any insertion of the door.

Moreover it should be pointed out that instead of using the round iron rod 25, also other suitable packing means can be adopted, for instance asbestos rope or flat-irons similar to the outer packing means, as shown on the drawings. Furthermore it is possible to utilize the rim projection 24 as packing means and to arrange it with a knife-like rim.

Finally, the supporting pins 20 for the inner door framing may be firmly coupledwith the casting for the screws lfl and then the outer door frame can be arranged in a relatively movable way. This method of carrying out the invention has, however, the disadvantage against the Construction shown on the drawings, that a stufiing box or a similar packing has to be inserted between the sheet plate |8 and the casting 12. In the construction of the invention as shown on the drawings, this provision is not necessary since the supporting pins are placed movably in compartments in the castings l2 thus being gas tight from outside.

I have now above described the present invention on the lines of a preferred embodiment thereof, but my invention is not limited in all its aspects to the mode of it can'ying out as described and shown, since the invention may be variously embodied within the scope of the following claims.

I claim:

1. A coke oven door assembly or the like with metal-to-metal gas-tight sealing, comprising an inner rigid door plug body; an outer resilient scaling member adapted to seat against the door frame for the door in the closed position of the door, and means for latching the door to the door iframe, said resilient member being adjustable and connected with the inner rigid door bod'y by means of an outer elastic sheet metal plate; an inner scaling member on the inner rigid door body, said inner scaling member being adapted to seat in the closed position of the door against the door frame in a zone lying between the outer scaling member and the coking chamber; said inner rigid door plug body and said outer elastic sheet metal plate separably being connected with each other for separate movement as unitary wholes relative to each other and being provided with means for regulably adjusting the distance between them whereby said outer and said inner sealing members may be adjustable relative to each other in the direction of the doorway.

2. A coke oven door assembly as claimed in claim 1, and in which the inner of the scaling members is pressed against the door frame in the closed position of the door by means of spring means interposedbetween, and acting on, the inner rigid door body and the outer elastic metal plate.

3. A coke oven door assembly as claimed in claim 1, and in which a set screw is provided as the means for regulating the distance between the inner rigid door-plug body and outer metal plate for adjusting said scaling members relatively to one another.

4. A coke oven door assembly as claimed in claim 1, and in which the inner scaling member is constituted of a metal-sealing rod round in cross section.

5. A coke oven door assembly as claimed' in claim 1, and in which the means for adjusting the outer scaling member and the inner scaling member relatively to each other are arranged on the outside of the coke oven door.

PAUL VAH ACKEREN. 

